D2D Terminal Carrier Aggregation Synchronization
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Solution Overview
Problem
In device-to-device (D2D) direct communication using carrier aggregation in NR sidelink, achieving required quality and supporting specified functions is challenging due to differences in carrier configurations and information items, such as numerologies and PSBCH information, between carriers.
Innovation Solution
A terminal is provided with a control unit that performs synchronization based on a first carrier in D2D direct communication and a communication unit that uses both the first carrier and a second carrier for transmission and reception. The control unit determines the configuration of the second carrier based on information obtained from the first carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier aggregation is applied in NR sidelink D2D communication, then communication capacity and quality are improved, but configuration complexity and operational uncertainty increase due to different numerologies and information items between carriers
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting numerology parameters (subcarrier spacing, cyclic prefix length) and information items (DFN, slot index, TDD configuration) based on carrier-specific conditions. The control unit determines appropriate parameters for each carrier to maintain synchronization while accommodating different configurations, thereby improving communication quality without excessive complexity increase.
Solution Approach 2:
The patent segments the carrier aggregation system into independent configuration units, where each carrier can have its own numerology and information items determined separately by the control unit. This segmentation allows flexible configuration of multiple carriers with different parameters while maintaining overall system synchronization through the primary carrier reference.
2Reliability
If synchronization is performed using one carrier, then synchronization is achieved, but operational uncertainty remains for other carriers with different configurations
Solution Approach 1:
The patent uses the primary carrier as an intermediary reference for synchronization. The control unit determines configurations of secondary carriers based on information obtained from the primary carrier, allowing all carriers to be synchronized through the primary carrier while accommodating carrier-specific differences in numerology and information items.
Data Source
AI summary
A terminal includes: a control unit configured to perform synchronization based on a first carrier in a device to device direct communication to which carrier aggregation is applied; and a communication unit configured to perform transmission and reception by using the first carrier and a second carrier that is different from the first carrier, based on the synchronization. The control unit determines a configuration of the second carrier, based on information that is obtained in the first carrier.